Fever after Pyrantel + Sarolaner (Simparica Trio) in dogs

The FDA has received 318 reports of fever in dogs after Pyrantel + Sarolaner. That is 0.6% of all reports for this medicine, compared with 1.4% across reports for all dog medicines, so it is reported less often than average with this medicine.

318Reports
84%Marked serious
14%Recovered
15%Died or euthanised
1 daysTypical onset
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How soon it started

Same day
105 35%
1–2 days
77 26%
3–7 days
40 14%
1–4 weeks
32 11%
Over a month
42 14%

How the animals did

Recovered
45 14%
Still unwell when reported
202 64%
Died
24 7.5%
Euthanised
23 7.2%
Not known
24 7.5%

Problems reported at the same time

Age of the animals

Under 1 year
90
1–3 years
90
4–7 years
62
8–11 years
50
12+ years
18

About this medicine

Pyrantel treats roundworms and hookworms. Sarolaner kills fleas, ticks and some mites; monthly.

Products with this combination include Simparica Trio (which also contains moxidectin). The FDA hides brand names in its public data, so these reports cover every product with the same active ingredients.

Questions owners ask

Can Pyrantel + Sarolaner cause fever in dogs?
318 reports link the two, but a report alone does not prove the medicine was the cause: other illnesses, other medicines or coincidence can be involved. Your vet can judge it for your animal.
How soon after a dose was it reported?
In half of the reports with dates, it started within 1 day of the first dose.
What should I do?
Don't give another dose until you've spoken to your vet, and keep the packaging so you can tell them the product and dose. Your vet can also report it to the FDA (or you can, through the manufacturer or FDA form 1932a).

Fever with similar medicines

All reported side effects of Pyrantel + Sarolaner in dogs · Medicines most reported with fever